CN101719761B - Precise frequency tracking circuit - Google Patents
Precise frequency tracking circuit Download PDFInfo
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- CN101719761B CN101719761B CN2009102528232A CN200910252823A CN101719761B CN 101719761 B CN101719761 B CN 101719761B CN 2009102528232 A CN2009102528232 A CN 2009102528232A CN 200910252823 A CN200910252823 A CN 200910252823A CN 101719761 B CN101719761 B CN 101719761B
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- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 230000003287 optical effect Effects 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 239000003381 stabilizer Substances 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention relates to a precise frequency tracking circuit. The circuit is formed by connecting a voltage-stabilizing circuit, voltage-dividing, filtering and amplitude limiting circuits, a high input resistance difference ratio operational circuit, a comparison circuit and an optical coupling isolating circuit; the voltage-stabilizing circuit comprises capacitors C3 and C4, a resistor R21, and a voltage-stabilizing tube Z1; the voltage-dividing, filtering and amplitude limiting circuits comprise resistors R1, R2, R7, R8, R9 and R10, capacitors C1 and C2, an electrolytic capacitor E1, and diodes D1 and D2; the voltage-dividing circuit comprises R1, R2, R7, R8, R9 and R10, the filtering and amplitude limiting circuits comprise C1, D1 and D2, and the other filtering circuit comprises C2 and E1; the high input resistance difference ratio operational circuit comprises resistors R3, R4, R5, R6, R11, R12, R13, R14, R15, R16, and operational amplifiers UIB, UIC and UID; the comparison circuit comprises resistors R17, R18 and R19, and operational amplifiers UIA; and the optical coupling isolating circuit comprises a resistor R20 and a photocoupler U2. The precise frequency tracking circuit has broad tracking frequency range, strong anti-interference capacity and lower cost.
Description
Technical field
The present invention relates to a kind of frequency tracking circuit, particularly a kind of precise frequency tracking circuit.
Background technology
At present, in general frequency tracking circuit, because the frequency of measuring-signal fluctuates in the scope of a broad, often exist and follow the tracks of coarse phenomenon, if the tracking inaccuracy, the output signal of tracking will be handled to subordinate and bring very big error into, and whole system is also just inaccurate; In addition, there is a serious defective in traditional frequency tracking circuit, the tracking frequency narrow range, there is the tracking frequency distortion during low frequency, this distortion directly causes the unavailability of system, how to improve frequency fluctuation to the influence of tracking effect with how to increase the performance that the frequency-tracking scope directly determines frequency tracking circuit.
Therefore, provide a kind of simple in structure, reasonable in design, use easy, obvious results precise frequency tracking circuit, be one of these those skilled in the art problem that should address.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, a kind of circuit advantages of simple, performance is safe and reliable, applicability is strong precise frequency tracking circuit are provided.
The technical solution adopted in the present invention is for achieving the above object: a kind of precise frequency tracking circuit is characterized in that: this circuit is connected and composed by difference ratio computing circuit, comparison circuit and the optical coupling isolation circuit of voltage stabilizing circuit, dividing potential drop filtering amplitude limiter circuit, high input resistance; Input VF+ in the described voltage stabilizing circuit connects an end of capacitor C 3, resistance R 21, and input VF-connects the other end of capacitor C 3, the positive input of voltage-stabiliser tube Z1, an end of capacitor C 4, the other end of another termination voltage-stabiliser tube Z1 of resistance R 21, the other end of capacitor C 4; The end of input V connecting resistance R1 in the described dividing potential drop filtering amplitude limiter circuit, the end of the other end connecting resistance R2 of resistance R 1, the other end connecting resistance R3 of resistance R 2, the end of R9, one end of another termination capacitor C 1 of R3, the negative terminal of diode D1, the anode of D2, the end of input W connecting resistance R7, the end of the other end connecting resistance R8 of resistance R 7, the other end connecting resistance R10 of resistance R 8, the end of R11, the other end of resistance R 9, R10, input VE1 join the other end of another termination capacitor C 1 of resistance R 11, the anode of diode D1, the negative terminal of D2; Another termination operational amplifier U1C positive input of the resistance R 3 in the difference ratio computing circuit of described high input resistance, the reverse input end connecting resistance R4 of operational amplifier U1C, the end of R12, the end of the other end connecting resistance R5 of resistance R 4, the output of operational amplifier U1C, the positive input of another termination operational amplifier U1D of resistance R 11, the reverse input end connecting resistance R12 of operational amplifier U1D, the end of R13, the output of another termination operational amplifier U1D of resistance R 13, one end of resistance R 14, the end of the other end connecting resistance R6 of resistance R 5, the reverse input end of operational amplifier U1B, the output of another termination operational amplifier U1B of resistance R 6, the positive input connecting resistance R14 of operational amplifier U1B, the end of R15, another termination input VE1 of resistance R 15, resistance R 16, R18, one end of capacitor C 2, the anode of the output termination electrochemical capacitor E1 of operational amplifier U1B, the negative terminal connecting resistance R16 of electrochemical capacitor E1, R17, one end of capacitor C 2; The reverse input end of one termination operational amplifier U1A of the resistance R 17 in the described comparison circuit, the positive input of the termination operational amplifier U1A of resistance R 18, R19, the output of its another termination operational amplifier U1A, 4,11 pins of operational amplifier U1A meet VF+, VF-respectively; The output of one termination operational amplifier U1A of the resistance R 20 in the described optical coupling isolation circuit, 2 pins of its another termination photoelectrical coupler U2,1 pin of photoelectrical coupler U2 meets VF+, its 3 pin ground connection, 4 pins are output FCH.
The invention has the beneficial effects as follows: its circuit is simple, and is reasonable in design, is suitable for strong operability.Low cost of manufacture uses energy consumption low, and tracking effect is good, and following range is wide, is difficult for disturbing other circuit or is disturbed by other circuit, and stable and reliable for performance, the scope of application is extensive.
Description of drawings
Fig. 1 is the schematic diagram of circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, details are as follows for feature:
Referring to Fig. 1, a kind of precise frequency tracking circuit, this circuit is connected and composed by difference ratio computing circuit, comparison circuit and the optical coupling isolation circuit of voltage stabilizing circuit, dividing potential drop filtering amplitude limiter circuit, high input resistance; Input VF+ in the described voltage stabilizing circuit connects an end of capacitor C 3, resistance R 21, and input VF-connects the other end of capacitor C 3, the positive input of voltage-stabiliser tube Z1, an end of capacitor C 4, the other end of another termination voltage-stabiliser tube Z1 of resistance R 21, the other end of capacitor C 4; The end of input V connecting resistance R1 in the described dividing potential drop filtering amplitude limiter circuit, the end of the other end connecting resistance R2 of resistance R 1, the other end connecting resistance R3 of resistance R 2, the end of R9, one end of another termination capacitor C 1 of R3, the negative terminal of diode D1, the anode of D2, the end of input W connecting resistance R7, the end of the other end connecting resistance R8 of resistance R 7, the other end connecting resistance R10 of resistance R 8, the end of R11, the other end of resistance R 9, R10, input VE1 join the other end of another termination capacitor C 1 of resistance R 11, the anode of diode D1, the negative terminal of D2; Another termination operational amplifier U1C positive input of the resistance R 3 in the difference ratio computing circuit of described high input resistance, the reverse input end connecting resistance R4 of operational amplifier U1C, the end of R12, the end of the other end connecting resistance R5 of resistance R 4, the output of operational amplifier U1C, the positive input of another termination operational amplifier U1D of resistance R 11, the reverse input end connecting resistance R12 of operational amplifier U1D, the end of R13, the output of another termination operational amplifier U1D of resistance R 13, one end of resistance R 14, the end of the other end connecting resistance R6 of resistance R 5, the reverse input end of operational amplifier U1B, the output of another termination operational amplifier U1B of resistance R 6, the positive input connecting resistance R14 of operational amplifier U1B, the end of R15, another termination input VE1 of resistance R 15, resistance R 16, R18, one end of capacitor C 2, the anode of the output termination electrochemical capacitor E1 of operational amplifier U1B, the negative terminal connecting resistance R16 of electrochemical capacitor E1, R17, one end of capacitor C 2; The reverse input end of one termination operational amplifier U1A of the resistance R 17 in the described comparison circuit, the positive input of the termination operational amplifier U1A of resistance R 18, R19, the output of its another termination operational amplifier U1A, 4,11 pins of operational amplifier U1A meet VF+, VF-respectively; The output of one termination operational amplifier U1A of the resistance R 20 in the described optical coupling isolation circuit, 2 pins of its another termination photoelectrical coupler U2,1 pin of photoelectrical coupler U2 meets VF+, its 3 pin ground connection, 4 pins are output FCH.
Main component parameter is for example selected:
Resistance is 1K Ω, 3K Ω, 5.1K Ω, 10K Ω, 91K Ω or 1M Ω;
Capacitance is 0.1 μ F;
The electrochemical capacitor capacity is 10 μ F;
The diode model is 4007;
The operational amplifier model is L347;
The photoelectrical coupler model is TLP181.
Operation principle: this circuit is provided with input V, the W of quarter-phase circuit, an output FCH.Circuit is divided into four parts, and first is voltage stabilizing part, i.e. voltage stabilizing circuit: be made up of resistance R 21, capacitor C 3, C4 and voltage-stabiliser tube Z1; Second portion is that part is prepared in input, i.e. dividing potential drop filtering amplitude limiter circuit is passed through resistance R 1, R2, R7, R8, R9, R10 dividing potential drop to two phase input signals earlier, by capacitor C 1 filtering, uses diode D1, D2 amplitude limit again, for subordinate's circuit provides input signal then; Third part is the difference ratio computing circuit of high input resistance, input stage at the subtraction circuit that is made of operational amplifier U1B adds the in-phase proportion computing circuit respectively, this has overcome two shortcomings of independent use subtraction circuit: the one, resistance choose and adjust inconvenience, the 2nd, to each signal source, input resistance is all less.After input stage adding in-phase proportion was far calculated circuit, the two input input resistances of U1B can think that all resistance is infinitely great.The 4th part is that output is relatively isolated in filtering, carry out filtering by electrochemical capacitor E1,2 pairs of prime subtraction circuits of capacitor C, filtered signal is added in the comparison circuit that is made of operational amplifier U1A, the output of comparison circuit is added on the optocoupler TLP181, isolates output pulse signal by optocoupler TLP181 at last.
Above-mentionedly with reference to example this precise frequency tracking circuit being described in detail, is illustrative rather than determinate, therefore in the variation and the modification that do not break away under the general plotting of the present invention, should belong within protection scope of the present invention.
Claims (1)
1. precise frequency tracking circuit, it is characterized in that: this circuit is connected and composed by difference ratio computing circuit, comparison circuit and the optical coupling isolation circuit of voltage stabilizing circuit, dividing potential drop filtering amplitude limiter circuit, high input resistance; Input VF+ in the described voltage stabilizing circuit connects an end of capacitor C 3, resistance R 21, and input VF-connects the other end of capacitor C 3, the positive input of voltage-stabiliser tube Z1, an end of capacitor C 4, the other end of another termination voltage-stabiliser tube Z1 of resistance R 21, the other end of capacitor C 4; The end of input V connecting resistance R1 in the described dividing potential drop filtering amplitude limiter circuit, the end of the other end connecting resistance R2 of resistance R 1, the other end connecting resistance R3 of resistance R 2, the end of R9, one end of another termination capacitor C 1 of R3, the negative terminal of diode D1, the anode of D2, the end of input W connecting resistance R7, the end of the other end connecting resistance R8 of resistance R 7, the other end connecting resistance R10 of resistance R 8, the end of R11, the other end of resistance R 9, R10 joins the other end of another termination capacitor C 1 of resistance R 11, the anode of diode D1, the negative terminal of D2 with input VE1; Another termination operational amplifier U1C positive input of the resistance R 3 in the difference ratio computing circuit of described high input resistance, the reverse input end connecting resistance R4 of operational amplifier U1C, the end of R12, the end of the other end connecting resistance R5 of resistance R 4, the output of operational amplifier U1C, the positive input of another termination operational amplifier U1D of resistance R 11, the reverse input end connecting resistance R12 of operational amplifier U1D, the end of R13, the output of another termination operational amplifier U1D of resistance R 13, one end of resistance R 14, the end of the other end connecting resistance R6 of resistance R 5, the reverse input end of operational amplifier U1B, the output of another termination operational amplifier U1B of resistance R 6, the positive input connecting resistance R14 of operational amplifier U1B, the end of R15, another termination input VE1 of resistance R 15, resistance R 16, R18, one end of capacitor C 2, the anode of the output termination electrochemical capacitor E1 of operational amplifier U1B, the negative terminal connecting resistance R16 of electrochemical capacitor E1, R17, one end of capacitor C 2; The reverse input end of one termination operational amplifier U1A of the resistance R 17 in the described comparison circuit, the positive input of the termination operational amplifier U1A of resistance R 18, R19, the output of its another termination operational amplifier U1A, 4,11 pins of operational amplifier U1A meet VF+, VF-respectively; The output of one termination operational amplifier U1A of the resistance R 20 in the described optical coupling isolation circuit, 2 pins of its another termination photoelectrical coupler U2,1 pin of photoelectrical coupler U2 meets VF+, its 3 pin ground connection, 4 pins are output FCH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102528232A CN101719761B (en) | 2009-11-28 | 2009-11-28 | Precise frequency tracking circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102528232A CN101719761B (en) | 2009-11-28 | 2009-11-28 | Precise frequency tracking circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101719761A CN101719761A (en) | 2010-06-02 |
| CN101719761B true CN101719761B (en) | 2011-12-07 |
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| CN2009102528232A Expired - Fee Related CN101719761B (en) | 2009-11-28 | 2009-11-28 | Precise frequency tracking circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931908A (en) * | 2012-11-12 | 2013-02-13 | 湘煤立达矿山装备股份有限公司 | Orthogonal pulse capture circuit for variable-frequency governor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854375A (en) * | 2012-09-07 | 2013-01-02 | 哈尔滨工业大学 | High-speed voltage and current analog quantity acquisition system based on FPGA (field programmable gate array) |
| CN108828392A (en) * | 2018-08-10 | 2018-11-16 | 江苏波普电力科技有限公司 | A kind of electricity cut-off type electric leakage signal recognition methods and electricity cut-off type electric leakage detector |
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2009
- 2009-11-28 CN CN2009102528232A patent/CN101719761B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931908A (en) * | 2012-11-12 | 2013-02-13 | 湘煤立达矿山装备股份有限公司 | Orthogonal pulse capture circuit for variable-frequency governor |
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| Publication number | Publication date |
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| CN101719761A (en) | 2010-06-02 |
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Owner name: TIANJIN NUOERHADUN ELECTRICAL APPLIANCE MANUFACTUR Free format text: FORMER OWNER: NUOER ELECTRIC CO., LTD., TIANJIN CITY Effective date: 20100825 |
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Effective date of registration: 20100825 Address after: 300381 Tianjin City, Xiqing Economic Development Zone Industrial Park Ze Road No. 20 Hung Temple Applicant after: Tianjin Nuoerhatun Electric Manufacturing Co.,Ltd. Address before: 300381 Tianjin City, Xiqing Economic Development Zone Industrial Park Ze Road No. 20 Hung Temple Applicant before: Tianjin Nole Electricity Co.,Ltd. |
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Owner name: TIANJIN NOLE ELECTRICITY CO., LTD. Free format text: FORMER NAME: TIANJIN NUOERHADUN ELECTRIC CO., LTD. Owner name: TIANJIN NUOERHADUN ELECTRIC CO., LTD. Free format text: FORMER NAME: TIANJIN NOLE ELECTRICITY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 300385 Tianjin City Economic Development Zone Xiqing Dasi Industrial Park Jintai Road No. 6 Patentee after: TIANJIN NOLE ELECTRIC Co.,Ltd. Address before: 300385 Tianjin City Economic Development Zone Xiqing Dasi Industrial Park Jintai Road No. 6 Patentee before: Tianjin Knoll Hatton Electric Co.,Ltd. |
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| CP03 | Change of name, title or address |
Address after: 300385 Tianjin City Economic Development Zone Xiqing Dasi Industrial Park Jintai Road No. 6 Patentee after: Tianjin Knoll Hatton Electric Co.,Ltd. Address before: 300381 Tianjin City, Xiqing Economic Development Zone Industrial Park Ze Road No. 20 Hung Temple Patentee before: Tianjin Nuoerhatun Electric Manufacturing Co.,Ltd. |
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Denomination of invention: Precise frequency tracking circuit Effective date of registration: 20140714 Granted publication date: 20111207 Pledgee: Pudong Shanghai Development Bank Limited by Share Ltd. Tianjin branch Pledgor: TIANJIN NOLE ELECTRIC Co.,Ltd. Registration number: 2014120000034 |
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Granted publication date: 20111207 Termination date: 20161128 |